Pump



May 29, 1928. l 1,671,565

l J. AsTRoM lPUMP Filed July 12, 1924 Patented May a9, 192s.

' f Uni A,sa

JOHN -As'rRona or FQRTWAYNE, INDIANA, AssIGNon VTo FORT WAYNEENGINEERQ,

ING sa MANTINACTURING oo.,

AOF FORT WAYNE, INDIANA.,

frUMP.

f'appucation-fuea July 12,A 1924. serial No.. 725,632.

ywhich has a very small clearance space` at the Aend of the pistonv travel, to provide "a pump which produces a'good suction, and to' provide inlet Yand outlet ports 'of very large sizeas compared with the area of the piston to permit complete illing of the'vcylinder 4even'at high yspeeds ofthe pump. Q f

. portions detached.v

` Figure 4 is. a Sectional viw on the lignei c cOfFigurQ1 i rotary typewhich, although drivenxatf a highspeed, is reje from vibration, as all of the parts are evenly balancedyand .to pro-l v v idea rotary pump in which 'aminimumA of An embodiment `of the invention isv shown Figure 2gis a ltransverse section on the Av housing 1' is provided which has any;

`lindricalbore 2 open at one en'd, b ut closed by. a 'wallj3 at theother' end. The wallis provided 'with a l'circular aperturefe'concentric with bore- 2jan'd also concentric withl astutfing box-.5 formed bythe annular ex-y tensionl 'ofthehousing 1. v The extension 6 is threaded 'atfit's outer part and receives` t a cap 7 whereby a gland `8 is r'orcedr into thef Stffng boi 5`f0r the Purpose @tracking-'a shaft passing therethrough in the usual manner. In'pthe bored portiony 2 vof the housing 1, -and spaced some distance/from thewall 3, are two opposed portopening's 91 and 10 whichon onek side establish comfy munication with opening 11 y and with cush-y ionch'amberl and on J the opposite side When, therefore, alrotary mot-ion is im#r tfparted'to rotor shaft19, the'piston20,1bing y fg'uidedinQ slot^`16 yof thefrotor, i'sforced to establish similar communication with .open-` ing 1 2 and cushion chamber L Said cushion 'chambers are formed byan extension i of 'housing 1,*and`are separated'fby a wallv The vhousing 1 `ris' supported 'byA a y ably arranged extension 16.

l' rotor having a Aegflinz'lrinl portion 1'? Frthervobjects! are to provide a pumpfof withV ayrectangular slot 18 extending-'into itf. at one? end, andafshaft portion!19pm-fr?, truding :tromit at the opposite 'endfis 'fitted within' the' cylindrical bore 2 of; hous'ingflv in a clo's'elyftt'ed slidable contact with'the p bore andwall 3,"and thesliaft 19V thereof lextends through laperture. 4 and stuliingvbox --1 with the housing 5.V The slot 18l is inline port openings `9 and 10.

nto .the slot 18 of the rotorapist'on 2Q" of, rectangular. cross-section corresponding tof the yslot'18A is fitted infslidablecontanti'l therewith. 'The ycross;sectionlof vthe pistn?- corresplonds .tol that of *the slot, but? its" length isy shorter than the length 'of Ithe slot accordance with 'the ystroke vofthe pump; lTheen'd'facesof'piston20 areoffa'i circular A"shape to correspond toi` the curva' ture of Ltheybore 2 of' thefhousingwl. Thei *l f y piston r18is further provided with acir'cular A dragcran'k having a cylindricalprtion 22Iandja shaft portion has ajfcrankpin 24 which vtits into the circularV hole '21 ofthe kpiston `201 The :shaft portion 23 ofv the drag crank isV yiitted; into the]cylind'nl calj-`I fbo're 24 of thehead 25.'v This-,head` hasl afs'ecf-"` ond cylindrical v`bore V26 for "the purpose .f

. carrying therein 'the cylindricalportion v22 r ,f

ofth'e" drag crank in slidable contacnii The head 2`5fh'as` a portion27 closelyffitted into thfe" housing-*bore 2"andy has" a1 iang'ev28' adapted tolbe bolted` against the Ahousin'ilvr i isi"v 9o l' in jse'aled connection v therewith. The tances or proportions' yof al1 thefparts de--v scribed arek such that "when fassembledjas shown, the interior of the bore2 of housing liscompletely filled except forthe spacea f? either or both "lends: ofthe piston 20.'v ,'"It `will'no'w .'be observed that, asplain'ly As a consequence the rotor shaft }19andl the drag lcrankshaft '23 rotate 'onfoiit'set centers'i rotate-,g and Since' 'the @rankpiny 24 ef` the 'drag crankis held in the -ho'le 21 ofthe pis`lv rT12-bite] tattile otsetof the, two clittslfmena A vasetto *y tioned, the pistoii`20`y will have a sliding m0- tion in slot 18 relative to the rotor of twice lthe ainountmot the oiset between the tvvo` shafts -tor yevery -half turn of the rotor,-anfd y. f-.vill slide 'roin-one'lextremeposition i'n slot` '18 tothe other and return to its original position during every complete turn` ott-heY rotor.

terfotthe rotor and Starting from the position of parts shovvii nfFigure 2 -jand rotating the rotorin the direction :of the varrowthe `piston 2O being in Contact ,with the Wall ot the bore 2 of casing 1 will ,graduallyl be orcedtowardsthe centhrough openingll givill bedravvn into the recess thus Liforiiied, inthe rotor through port y9. When olie halt' rturn has beeircompleted I' the piston has passed the center of the rotor t motion inthe.l opposite and traveled' vto .the oppositev extreme positionand jat this pointthe unslotted part of.

'the rotorsv closes communication vl'ietfvveen the l p nd' thepoi't 19 thus'trapp'ing the' liquid drawn. into the rotor. As I.the ro'- tationf proceeds the` piston performs .the saine direction thereby displacing theliqujid througliportvl() and openiiigv12 out-Teli the pump.

7 action talesgplace `at. one yend of the piston f openingV and closing f of "communication be*- the k:inl't and l'discharge sides of the pump;

the' opposite y,end -operatr-:s lin an ident-ical manner but one half turn inadvance. f. The

tweenpiston .and-ports is done by lthe unslottpidy partlof lthe rotor A* Which takes thew v -v place lo ffvalves'in*the ordinary pump, and

' o tlports 9 and 10 is'such that the rotor at the proportion'of Widthoislot 18and length all timesprevents communication between It is yto be noted `.that theqpiston is not operated by contacting, with the inner surface of the bore 2 ofthe housing inthe inan-v 1 Iier otra cam, but is operated positively bymeans ofthe crank; pin2i and thus Wear and .and therefore perfectlybalanced.-

\ thatthe.piston 2O is located centrally.. iny re-v held.- yin. that `positionjby Vpin-,'21 :which fillsl the hole Y19 completely;

A pistonifthereforeancedunit about 55y uncertainaction i of "the Y piston and rotor due tojt-hislusual,causeis Wholly eliminated. p lt-.will'ffurtherfbe observed that the rotor is symnietricalgabout the axis; of itsgsaft lso haft 22 of the. drag crank and gardfto; the ,s

The dragerank` and also torni a perfectly balparts of, the puinp' are therefore completely balancedi'and Will vgive risetono vibrations regardless ofthe speed at v'which the pump ,'fisOpeilated-` v l moves in-the rotor.it 4is in communication with :theyports andfat'l the quarter vturn positions l`Where its relative municationffis piston;

pump to speed {istheshighestthe area of such comthe kfull projected, area 'of the lThislargeport area permits the be operated at a very high rate of liquid entering the pump on each stroke.

While the described" y Althou'ghzthe inventionhasbeen,described the-shaft2 3.A The moving y n fitting said slot, a Cap having a vshaft, said aperture,y and Y l v Qhaving a crank pin iitted vvvithin said plungspeed `Without Wire-drawing'y or yobst'friiction to the 'tloW of liquid into the rotor.

` The pump having one complete lsuction and discharge p stroke at 1 `each y--end*torpsueh revolution makes it correspond in its action to a doubleacting pumppivhich, combined With .th-e high permissible speed of yrotation givesa veryy unifor'inflow of liquid.

The piston alt'thecompleti'onof each dis' 75 charge stroke comes in sliding contact With the bore of thefhousingivhic'h practically I eliminates all '('zlearan'ce space and insures a powverfulrsiic'tion liquid dravvii'in by thepistoii is'fdispla'oed plain from' the above'` that all the purposes of this invention have been accomplishedin a very siinple manner and'that the pfumpcan be builtin a verysma'll size Withoutthe lossvot any of the characteristic 'featuresthereoi Y Itis thus pump constructed lin" accordance .With this invention and of rverySi'nall size Weighs*A ing approximately six-pounds and having al ttvounchj bore rin* they housings,wasy found atv du@ tothe fact-'that au the u i 90 -1200 R. 12M. tojhave'1l00% volumetric eficiency. `This pump; delivered about sixtyp' ive'gallonsof liquid 'per liourfvvith a suctionl of twenty-tive inches of K y discharge pressure Aup to'gone hundred Vpounds mercury against a' y.

a square inch. This test showed conclusivelyv that the pump had the iemarlrableproperty j d i of perfect volumetric.ethciency,.zofjhiglilsucl tion andfreedom roinfdestructive 'vibration althoughvof small sizes and yofthe krotary in considerable detail, it is t'ofbe understood that the invention/may befvari'ously `emtor said-.Casing having a bore oiset froinrthe. center lineot said rotor',y and acrank having an extension revollibly fitting said :bore and having'ia'fpin fit`` ting Within said plunger.l c `2. .A rotary pumpjcomprising. ya cylindri- 11'5 into' Said f rvchambers, a cylindricalV rotor mounted Withl Ain saidcylindrical portion and having a di` ainetricallyflocated slot,rv a plunger sli'dably.. 12()` Acal ,casiiiga rotor mounted therein and rotor having a transverse aperture therein, va plungerfiittiiig 4said .a *crank having .a shaft and l iso u er, .the shaft-of said crank being offset from` the shaft of said'rotor, saidrotor'being bal` anced about the-rotor shaft, and vsaidv crank, crank pinand plunger being balanced about said crank shaft;`

i 3. A rotary pump comprising cylindrical-casing, av cylindrical rotor' mounted 'Withf insaid casing, and having a. drivingshaft .ture and being ofslightlylesslength than theflength of saidfaperture, a disk having a projecting outwardly through said'oasing,

said rotor having av transversev aperture therethrough, a plunger fitting said aperprojecting central shaft odset with, reference to said first `mentioned shaft, a 'crank y pin projecting from `said w diskandv fitting said plunger, vvhereby'when said first men-v tioned shaft is rotated approximately sim# ple harmonic. motion isl imparted' to` said plunger, -said casingv having an elongated inlet andl outlet opening formed in loppov site sides thereof.

54:. A 'pump comprising a cylindrical cas-,2. ying, va cylindrical rotorvtting Within saidl casing, and havingan imperforate Wall on v one; face and a ydiainetrically arrangedslot passing through its`other face, said casing 4 having a Wall partially closing said slot and vhavinga cylindrical recess formed therein with the centerof the .recess oiset with re# spect to the center of the rotor, a solid disk v ofcircular contourtitting said rrecess and Ahaving 'a Hatv face forminga contlnuationr of theiiiner face 'of saidwalliandcompletf2 "':5

ing the closing ofthe slot, a "plungery slidably` mounted Within said vslot and of slightly 'less length than said slot,^anda pin A lpump *comprising a .cylindrical cas-f;

Veceentrically,carried by saidldisk and fitting i y with an aperture formed "iny saidfplunger.-

ing having :projecting upper portions., a partition Wall` separating saidfprojeeting-f portions yinto tWon cushioning chambersfsaid v -cylindrical casing shaving `elongated lslotsi, commun'ieating`r With v said chambers, 'fand saidicasing having inlet andoutlet openings y mounted Withinl said cylindr'icalcasing and ing a transversely slotted inner face,` afpiscommunicating with said'cha1`nbers,a..rotor` I l* g ing balancedabout its center of rotation-'and the axisof Said disc.

In testimony that Ivclaim'ithe.` foregoing I haveI hereunto Vset my-l hand atyflort"` fWay'Iv1e,jinl the count-yA of Allenand State. of j indiana.4 v 

